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Updated: Jun 30, 2025

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
Published on: May 15, 2018
Squeezing formaldehyde into C60 fullerene
Vijyesh K Vyas1, George R Bacanu1, Murari Soundararajan1
1School of Chemistry, University of Southampton, SO17 1BJ, Southampton, UK.
Researchers encapsulated formaldehyde within fullerene C60 cages using molecular surgery. This creates a unique CH2O@C60 complex, revealing novel properties like molecular rotation and quantized motion.
Area of Science:
- Supramolecular Chemistry
- Nanotechnology
- Physical Chemistry
Background:
- Fullerene C60 offers a confined, symmetric environment suitable for encapsulating guest molecules.
- Encapsulating molecules larger than the fullerene cavity presents significant challenges.
Purpose of the Study:
- To report the successful encapsulation of formaldehyde (CH2O) within the fullerene C60 cage.
- To investigate the structural, electronic, and dynamic properties of the resulting CH2O@C60 complex.
Main Methods:
- Molecular surgery techniques were employed for the encapsulation process.
- Spectroscopic methods including infrared (IR) and terahertz (THz) spectroscopy were used for characterization.
- Nuclear magnetic resonance (NMR) spectroscopy was utilized to study spin-spin couplings and relaxation dynamics.
Main Results:
- The supermolecular complex CH2O@C60 was successfully synthesized, despite formaldehyde's size exceeding the C60 cavity diameter.
- Encapsulated formaldehyde exhibited a reduced HOMO-LUMO gap, observable nuclear spin-spin couplings with the fullerene cage, and rapid 13C spin-lattice relaxation.
- Free rotation of formaldehyde along its axis at cryogenic temperatures was observed, alongside quantized translational modes indicative of a particle-in-a-box system.
Conclusions:
- The study demonstrates the feasibility of encapsulating formaldehyde within C60 via molecular surgery, creating a strained yet functional supramolecular system.
- The encapsulated formaldehyde displays unique quantum phenomena, including free rotation and quantized translational motion, influenced by the confining fullerene cage.
- The CH2O@C60 complex serves as a model system for exploring quantum effects in confined molecular environments.
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